Allanson O., C. E. Watt, H. Ratcliffe, N. P. Meredith, H. J. Allison, S. N. Bentley, T. Bloch, S. A. Glauert, (2019), Particle-in-cell Experiments Examine Electron Diffusion by Whistler-mode Waves: 1. Benchmarking With a Cold Plasma, J. Geophys. Res. [Space Physics], 124, 8893-8912, doi:10.1029/2019JA027088

## Abstract

Abstract Using a particle-in-cell code, we study the diffusive response of electrons due to wave-particle interactions with whistler-mode waves. The relatively simple configuration of field-aligned waves in a cold plasma is used in order to benchmark our novel method, and to compare with previous works that used a different modelling technique. In this boundary-value problem, incoherent whistler-mode waves are excited at the domain boundary, and then propagate through the ambient plasma. Electron diffusion characteristics are directly extracted from particle data across all available energy and pitch-angle space. The ‘nature’ of the diffusive response is itself a function of energy and pitch-angle, such that the rate of diffusion is not always constant in time. However, after an initial transient phase, the rate of diffusion tends to a constant, in a manner that is consistent with the assumptions of quasilinear diffusion theory. This work establishes a framework for future investigations on the nature of diffusion due to whistler-mode wave-particle interactions, using particle-in-cell numerical codes with driven waves as boundary value problems.## Authors (sorted by name)

Allanson Allison Bentley Bloch Glauert Meredith Ratcliffe Watt## Journal / Conference

Journal Of Geophysical Research (Space Physics)## Bibtex

@article{doi:10.1029/2019JA027088,
author = {Allanson, O. and Watt, C. E. J. and Ratcliffe, H. and Meredith, N. P. and Allison, H. J. and Bentley, S. N. and Bloch, T. and Glauert, S. A.},
title = {Particle-in-cell Experiments Examine Electron Diffusion by Whistler-mode Waves: 1. Benchmarking With a Cold Plasma},
journal = {Journal of Geophysical Research: Space Physics},
volume = {124},
number = {11},
pages = {8893-8912},
keywords = {Radiation belt, Wave-particle interaction, Whistler-mode wave, Particle-in-cell, Numerical experiment, Quasilinear theory},
doi = {10.1029/2019JA027088},
url = {https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2019JA027088},
eprint = {https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2019JA027088},
abstract = {Abstract Using a particle-in-cell code, we study the diffusive response of electrons due to wave-particle interactions with whistler-mode waves. The relatively simple configuration of field-aligned waves in a cold plasma is used in order to benchmark our novel method, and to compare with previous works that used a different modelling technique. In this boundary-value problem, incoherent whistler-mode waves are excited at the domain boundary, and then propagate through the ambient plasma. Electron diffusion characteristics are directly extracted from particle data across all available energy and pitch-angle space. The ‘nature’ of the diffusive response is itself a function of energy and pitch-angle, such that the rate of diffusion is not always constant in time. However, after an initial transient phase, the rate of diffusion tends to a constant, in a manner that is consistent with the assumptions of quasilinear diffusion theory. This work establishes a framework for future investigations on the nature of diffusion due to whistler-mode wave-particle interactions, using particle-in-cell numerical codes with driven waves as boundary value problems.},
year = {2019}
}